package com.vodbyte.movie.kkcling.server;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.Date;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Locale;
import java.util.Properties;
import java.util.StringTokenizer;
import java.util.TimeZone;
import java.util.Vector;

/**
 * A simple, tiny, nicely embeddable HTTP 1.0 server in Java
 * Modified from NanoHTTPD, you can find it here
 * http://elonen.iki.fi/code/nanohttpd/
 */
public class HttpServer {
    // ==================================================
    // API parts
    // ==================================================

    /**
     * Override this to customize the server.<p>
     * <p>
     * (By default, this delegates to serveFile() and allows directory listing.)
     *
     * @param uri    Percent-decoded URI without parameters, for example "/index.cgi"
     * @param method "GET", "POST" etc.
     * @param parms  Parsed, percent decoded parameters from URI and, in case of POST, data.
     * @param header Header entries, percent decoded
     * @return HTTP response, see class Response for details
     */
    public Response serve(String uri, String method, Properties header, Properties parms, Properties files) {
        System.out.println(method + " '" + uri + "' ");

        Enumeration e = header.propertyNames();
        while (e.hasMoreElements()) {
            String value = (String) e.nextElement();
            System.out.println("  HDR: '" + value + "' = '" +
                    header.getProperty(value) + "'");
        }
        e = parms.propertyNames();
        while (e.hasMoreElements()) {
            String value = (String) e.nextElement();
            System.out.println("  PRM: '" + value + "' = '" +
                    parms.getProperty(value) + "'");
        }
        e = files.propertyNames();
        while (e.hasMoreElements()) {
            String value = (String) e.nextElement();
            System.out.println("  UPLOADED: '" + value + "' = '" +
                    files.getProperty(value) + "'");
        }

        //Map uri to acture file in ContentTree

        String itemId = uri.replaceFirst("/", "");
        itemId = URLDecoder.decode(itemId);
        String newUri = null;

        if (ContentTree.hasNode(itemId)) {
            ContentNode node = ContentTree.getNode(itemId);
            if (node.isItem()) {
                newUri = node.getFullPath();
            }
        }

        if (newUri != null) uri = newUri;
        return serveFile(uri, header, myRootDir, false);
    }

    /**
     * HTTP response.
     * Return one of these from serve().
     */
    public class Response {
        /**
         * Default constructor: response = HTTP_OK, data = mime = 'null'
         */
        public Response() {
            this.status = HTTP_OK;
        }

        /**
         * Basic constructor.
         */
        public Response(String status, String mimeType, InputStream data) {
            this.status = status;
            this.mimeType = mimeType;
            this.data = data;
        }

        /**
         * Convenience method that makes an InputStream out of
         * given text.
         */
        public Response(String status, String mimeType, String txt) {
            this.status = status;
            this.mimeType = mimeType;
            try {
                this.data = new ByteArrayInputStream(txt.getBytes("UTF-8"));
            } catch (java.io.UnsupportedEncodingException uee) {
                uee.printStackTrace();
            }
        }

        /**
         * Adds given line to the header.
         */
        public void addHeader(String name, String value) {
            header.put(name, value);
        }

        /**
         * HTTP status code after processing, e.g. "200 OK", HTTP_OK
         */
        public String status;

        /**
         * MIME type of content, e.g. "text/html"
         */
        public String mimeType;

        /**
         * Data of the response, may be null.
         */
        public InputStream data;

        /**
         * Headers for the HTTP response. Use addHeader()
         * to add lines.
         */
        public Properties header = new Properties();
    }

    /**
     * Some HTTP response status codes
     */
    public static final String
            HTTP_OK = "200 OK",
            HTTP_PARTIALCONTENT = "206 Partial Content",
            HTTP_RANGE_NOT_SATISFIABLE = "416 Requested Range Not Satisfiable",
            HTTP_REDIRECT = "301 Moved Permanently",
            HTTP_FORBIDDEN = "403 Forbidden",
            HTTP_NOTFOUND = "404 Not Found",
            HTTP_BADREQUEST = "400 Bad Request",
            HTTP_INTERNALERROR = "500 Internal Server Error",
            HTTP_NOTIMPLEMENTED = "501 Not Implemented";

    /**
     * Common mime types for dynamic content
     */
    public static final String
            MIME_PLAINTEXT = "text/plain",
            MIME_HTML = "text/html",
            MIME_DEFAULT_BINARY = "application/octet-stream",
            MIME_XML = "text/xml";

    // ==================================================
    // Socket & server code
    // ==================================================

    /**
     * Starts a HTTP server to given port.<p>
     * Throws an IOException if the socket is already in use
     */
    public HttpServer(int port) throws IOException {
        myTcpPort = port;
        this.myRootDir = new File("/");
        myServerSocket = new ServerSocket(myTcpPort);
        myThread = new Thread(new Runnable() {
            public void run() {
                try {
                    while (true)
                        new HTTPSession(myServerSocket.accept());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
        myThread.setDaemon(true);
        myThread.start();
    }

    /**
     * Stops the server.
     */
    public void stop() {
        try {
            myServerSocket.close();
            myThread.join();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    /**
     * Handles one session, i.e. parses the HTTP request
     * and returns the response.
     */
    private class HTTPSession implements Runnable {
        public HTTPSession(Socket s) {
            mySocket = s;
            Thread t = new Thread(this);
            t.setDaemon(true);
            t.start();
        }

        public void run() {
            try {
                InputStream is = mySocket.getInputStream();
                if (is == null) return;

                // Read the first 8192 bytes.
                // The full header should fit in here.
                // Apache's default header limit is 8KB.
                int bufferSize = 8192;
                byte[] buf = new byte[bufferSize];
                int length = is.read(buf, 0, bufferSize);
                if (length <= 0) return;

                // Create a BufferedReader for parsing the header.
                ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(buf, 0, length);
                BufferedReader hin = new BufferedReader(new InputStreamReader(byteArrayInputStream));
                Properties pre = new Properties();
                Properties properties = new Properties();
                Properties header = new Properties();
                Properties files = new Properties();

                // Decode the header into parms and header java properties
                decodeHeader(hin, pre, properties, header);
                String method = pre.getProperty("method");
                String uri = pre.getProperty("uri");

                long size = 0x7FFFFFFFFFFFFFFFL;
                String contentLength = header.getProperty("content-length");
                if (contentLength != null) {
                    try {
                        size = Integer.parseInt(contentLength);
                    } catch (NumberFormatException ex) {
                        ex.printStackTrace();
                    }
                }

                // We are looking for the byte separating header from body.
                // It must be the last byte of the first two sequential new lines.
                int split = 0;
                boolean found = false;
                while (split < length) {
                    if (buf[split] == '\r' && buf[++split] == '\n' && buf[++split] == '\r' && buf[++split] == '\n') {
                        found = true;
                        break;
                    }
                    split++;
                }
                split++;

                // Write the part of body already read to ByteArrayOutputStream f
                ByteArrayOutputStream f = new ByteArrayOutputStream();
                if (split < length) f.write(buf, split, length - split);

                // While Firefox sends on the first read all the data fitting
                // our buffer, Chrome and Opera sends only the headers even if
                // there is data for the body. So we do some magic here to find
                // out whether we have already consumed part of body, if we
                // have reached the end of the data to be sent or we should
                // expect the first byte of the body at the next read.
                if (split < length)
                    size -= length - split + 1;
                else if (!found || size == 0x7FFFFFFFFFFFFFFFL)
                    size = 0;

                // Now read all the body and write it to f
                buf = new byte[512];
                while (length >= 0 && size > 0) {
                    length = is.read(buf, 0, 512);
                    size -= length;
                    if (length > 0)
                        f.write(buf, 0, length);
                }

                // Get the raw body as a byte []
                byte[] rawBuff = f.toByteArray();

                // Create a BufferedReader for easily reading it as string.
                ByteArrayInputStream bin = new ByteArrayInputStream(rawBuff);
                BufferedReader in = new BufferedReader(new InputStreamReader(bin));

                // If the method is POST, there may be parameters
                // in data section, too, read it:
                if (method.equalsIgnoreCase("POST")) {
                    String contentType = "";
                    String contentTypeHeader = header.getProperty("content-type");
                    StringTokenizer st = new StringTokenizer(contentTypeHeader, "; ");
                    if (st.hasMoreTokens()) {
                        contentType = st.nextToken();
                    }

                    if (contentType.equalsIgnoreCase("multipart/form-data")) {
                        // Handle multipart/form-data
                        if (!st.hasMoreTokens())
                            sendError(HTTP_BADREQUEST, "BAD REQUEST: Content type is multipart/form-data but boundary missing. Usage: GET /example/file.html");
                        String boundaryExp = st.nextToken();
                        st = new StringTokenizer(boundaryExp, "=");
                        if (st.countTokens() != 2)
                            sendError(HTTP_BADREQUEST, "BAD REQUEST: Content type is multipart/form-data but boundary syntax error. Usage: GET /example/file.html");
                        st.nextToken();
                        String boundary = st.nextToken();

                        decodeMultipartData(boundary, rawBuff, in, properties, files);
                    } else {
                        // Handle application/x-www-form-urlencoded
                        String postLine = "";
                        char buff[] = new char[512];
                        int read = in.read(buff);
                        while (read >= 0 && !postLine.endsWith("\r\n")) {
                            postLine += String.valueOf(buff, 0, read);
                            read = in.read(buff);
                        }
                        postLine = postLine.trim();
                        decodeParams(postLine, properties);
                    }
                }

                // Ok, now do the serve()
                Response r = serve(uri, method, header, properties, files);
                if (r == null)
                    sendError(HTTP_INTERNALERROR, "SERVER INTERNAL ERROR: Serve() returned a null response.");
                else
                    sendResponse(r.status, r.mimeType, r.header, r.data);

                in.close();
                is.close();
            } catch (IOException ioe) {
                try {
                    sendError(HTTP_INTERNALERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());
                } catch (Throwable t) {
                    t.printStackTrace();
                }
            } catch (InterruptedException ie) {
                // Thrown by sendError, ignore and exit the thread.
                ie.printStackTrace();
            }
        }

        /**
         * Decodes the sent headers and loads the data into
         * java Properties' key - value pairs
         **/
        private void decodeHeader(BufferedReader in, Properties pre, Properties parms, Properties header)
                throws InterruptedException {
            try {
                // Read the request line
                String inLine = in.readLine();
                if (inLine == null) return;
                StringTokenizer st = new StringTokenizer(inLine);
                if (!st.hasMoreTokens())
                    sendError(HTTP_BADREQUEST, "BAD REQUEST: Syntax error. Usage: GET /example/file.html");

                String method = st.nextToken();
                pre.put("method", method);

                if (!st.hasMoreTokens())
                    sendError(HTTP_BADREQUEST, "BAD REQUEST: Missing URI. Usage: GET /example/file.html");

                String uri = st.nextToken();

                // Decode parameters from the URI
                int qmi = uri.indexOf('?');
                if (qmi >= 0) {
                    decodeParams(uri.substring(qmi + 1), parms);
                    uri = decodePercent(uri.substring(0, qmi));
                } else uri = decodePercent(uri);

                // If there's another token, it's protocol version,
                // followed by HTTP headers. Ignore version but parse headers.
                // NOTE: this now forces header names lowercase since they are
                // case insensitive and vary by client.
                if (st.hasMoreTokens()) {
                    String line = in.readLine();
                    while (line != null && line.trim().length() > 0) {
                        int p = line.indexOf(':');
                        if (p >= 0)
                            header.put(line.substring(0, p).trim().toLowerCase(), line.substring(p + 1).trim());
                        line = in.readLine();
                    }
                }

                pre.put("uri", uri);
            } catch (IOException ioe) {
                sendError(HTTP_INTERNALERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());
            }
        }

        /**
         * Decodes the Multipart Body data and put it
         * into java Properties' key - value pairs.
         **/
        private void decodeMultipartData(String boundary, byte[] fbuf, BufferedReader in, Properties parms, Properties files)
                throws InterruptedException {
            try {
                int[] boundaryPositions = getBoundaryPositions(fbuf, boundary.getBytes());
                int boundaryCount = 1;
                String line = in.readLine();
                while (line != null) {
                    if (!line.contains(boundary))
                        sendError(HTTP_BADREQUEST, "BAD REQUEST: Content type is multipart/form-data but next chunk does not start with boundary. Usage: GET /example/file.html");
                    boundaryCount++;
                    Properties item = new Properties();
                    line = in.readLine();
                    while (line != null && line.trim().length() > 0) {
                        int p = line.indexOf(':');
                        if (p != -1)
                            item.put(line.substring(0, p).trim().toLowerCase(), line.substring(p + 1).trim());
                        line = in.readLine();
                    }
                    if (line != null) {
                        String contentDisposition = item.getProperty("content-disposition");
                        if (contentDisposition == null) {
                            sendError(HTTP_BADREQUEST, "BAD REQUEST: Content type is multipart/form-data but no content-disposition info found. Usage: GET /example/file.html");
                        }
                        StringTokenizer st = new StringTokenizer(contentDisposition, "; ");
                        Properties disposition = new Properties();
                        while (st.hasMoreTokens()) {
                            String token = st.nextToken();
                            int p = token.indexOf('=');
                            if (p != -1)
                                disposition.put(token.substring(0, p).trim().toLowerCase(), token.substring(p + 1).trim());
                        }
                        String pname = disposition.getProperty("name");
                        pname = pname.substring(1, pname.length() - 1);

                        String value = "";
                        if (item.getProperty("content-type") == null) {
                            while (line != null && !line.contains(boundary)) {
                                line = in.readLine();
                                if (line != null) {
                                    int d = line.indexOf(boundary);
                                    if (d == -1)
                                        value += line;
                                    else
                                        value += line.substring(0, d - 2);
                                }
                            }
                        } else {
                            if (boundaryCount > boundaryPositions.length)
                                sendError(HTTP_INTERNALERROR, "Error processing request");
                            int offset = stripMultipartHeaders(fbuf, boundaryPositions[boundaryCount - 2]);
                            String path = saveTmpFile(fbuf, offset, boundaryPositions[boundaryCount - 1] - offset - 4);
                            files.put(pname, path);
                            value = disposition.getProperty("filename");
                            value = value.substring(1, value.length() - 1);
                            do {
                                line = in.readLine();
                            } while (line != null && !line.contains(boundary));
                        }
                        parms.put(pname, value);
                    }
                }
            } catch (IOException ioe) {
                sendError(HTTP_INTERNALERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());
            }
        }

        /**
         * Find the byte positions where multipart boundaries start.
         **/
        public int[] getBoundaryPositions(byte[] b, byte[] boundary) {
            int matchCount = 0;
            int matchByte = -1;
            Vector matchBytes = new Vector();
            for (int i = 0; i < b.length; i++) {
                if (b[i] == boundary[matchCount]) {
                    if (matchCount == 0)
                        matchByte = i;
                    matchCount++;
                    if (matchCount == boundary.length) {
                        matchBytes.addElement(new Integer(matchByte));
                        matchCount = 0;
                        matchByte = -1;
                    }
                } else {
                    i -= matchCount;
                    matchCount = 0;
                    matchByte = -1;
                }
            }
            int[] ret = new int[matchBytes.size()];
            for (int i = 0; i < ret.length; i++) {
                ret[i] = ((Integer) matchBytes.elementAt(i)).intValue();
            }
            return ret;
        }

        /**
         * Retrieves the content of a sent file and saves it
         * to a temporary file.
         * The full path to the saved file is returned.
         **/
        private String saveTmpFile(byte[] b, int offset, int len) {
            String path = "";
            if (len > 0) {
                String tmpdir = System.getProperty("java.io.tmpdir");
                try {
                    File temp = File.createTempFile("NanoHTTPD", "", new File(tmpdir));
                    OutputStream out = new FileOutputStream(temp);
                    out.write(b, offset, len);
                    out.close();
                    path = temp.getAbsolutePath();
                } catch (Exception e) { // Catch exception if any
                    System.err.println("Error: " + e.getMessage());
                }
            }
            return path;
        }


        /**
         * It returns the offset separating multipart file headers
         * from the file's data.
         **/
        private int stripMultipartHeaders(byte[] b, int offset) {
            int i = 0;
            for (i = offset; i < b.length; i++) {
                if (b[i] == '\r' && b[++i] == '\n' && b[++i] == '\r' && b[++i] == '\n')
                    break;
            }
            return i + 1;
        }

        /**
         * Decodes the percent encoding scheme. <br/>
         * For example: "an+example%20string" -> "an example string"
         */
        private String decodePercent(String str) throws InterruptedException {
            try {
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < str.length(); i++) {
                    char c = str.charAt(i);
                    switch (c) {
                        case '+':
                            sb.append(' ');
                            break;
                        case '%':
                            sb.append((char) Integer.parseInt(str.substring(i + 1, i + 3), 16));
                            i += 2;
                            break;
                        default:
                            sb.append(c);
                            break;
                    }
                }
                return sb.toString();
            } catch (Exception e) {
                sendError(HTTP_BADREQUEST, "BAD REQUEST: Bad percent-encoding.");
                return null;
            }
        }

        /**
         * Decodes parameters in percent-encoded URI-format
         * ( e.g. "name=Jack%20Daniels&pass=Single%20Malt" ) and
         * adds them to given Properties. NOTE: this doesn't support multiple
         * identical keys due to the simplicity of Properties -- if you need multiples,
         * you might want to replace the Properties with a Hashtable of Vectors or such.
         */
        private void decodeParams(String params, Properties p)
                throws InterruptedException {
            if (params == null)
                return;

            StringTokenizer st = new StringTokenizer(params, "&");
            while (st.hasMoreTokens()) {
                String e = st.nextToken();
                int sep = e.indexOf('=');
                if (sep >= 0)
                    p.put(decodePercent(e.substring(0, sep)).trim(),
                            decodePercent(e.substring(sep + 1)));
            }
        }

        /**
         * Returns an error message as a HTTP response and
         * throws InterruptedException to stop further request processing.
         */
        private void sendError(String status, String msg) throws InterruptedException {
            sendResponse(status, MIME_PLAINTEXT, null, new ByteArrayInputStream(msg.getBytes()));
            throw new InterruptedException();
        }

        /**
         * Sends given response to the socket.
         */
        private void sendResponse(String status, String mime, Properties header, InputStream data) {
            try {
                if (status == null)
                    throw new Error("sendResponse(): Status can't be null.");

                OutputStream out = mySocket.getOutputStream();
                PrintWriter pw = new PrintWriter(out);
                pw.print("HTTP/1.0 " + status + " \r\n");

                if (mime != null)
                    pw.print("Content-Type: " + mime + "\r\n");

                if (header == null || header.getProperty("Date") == null)
                    pw.print("Date: " + gmtFrmt.format(new Date()) + "\r\n");

                if (header != null) {
                    Enumeration e = header.keys();
                    while (e.hasMoreElements()) {
                        String key = (String) e.nextElement();
                        String value = header.getProperty(key);
                        pw.print(key + ": " + value + "\r\n");
                    }
                }

                pw.print("\r\n");
                pw.flush();

                if (data != null) {
                    int pending = data.available();    // This is to support partial sends, see serveFile()
                    byte[] buff = new byte[2048];
                    while (pending > 0) {
                        int read = data.read(buff, 0, ((pending > 2048) ? 2048 : pending));
                        if (read <= 0) break;
                        out.write(buff, 0, read);
                        pending -= read;
                    }
                }
                out.flush();
                out.close();
                if (data != null)
                    data.close();
            } catch (IOException ioe) {
                // Couldn't write? No can do.
                try {
                    mySocket.close();
                } catch (Throwable t) {
                    t.printStackTrace();
                }
            }
        }

        private Socket mySocket;
    }

    /**
     * URL-encodes everything between "/"-characters.
     * Encodes spaces as '%20' instead of '+'.
     */
    private String encodeUri(String uri) {
        String newUri = "";
        StringTokenizer st = new StringTokenizer(uri, "/ ", true);
        while (st.hasMoreTokens()) {
            String tok = st.nextToken();
            if (tok.equals("/"))
                newUri += "/";
            else if (tok.equals(" "))
                newUri += "%20";
            else {
                newUri += URLEncoder.encode(tok);
                // For Java 1.4 you'll want to use this instead:
                // try { newUri += URLEncoder.encode( tok, "UTF-8" ); } catch ( java.io.UnsupportedEncodingException uee ) {}
            }
        }
        return newUri;
    }

    private int myTcpPort;
    private final ServerSocket myServerSocket;
    private Thread myThread;
    private File myRootDir;

    // ==================================================
    // File server code
    // ==================================================

    /**
     * Serves file from homeDir and its' subdirectories (only).
     * Uses only URI, ignores all headers and HTTP parameters.
     */
    public Response serveFile(String uri, Properties header, File homeDir,
                              boolean allowDirectoryListing) {
        Response res = null;

        // Make sure we won't die of an exception later
        if (!homeDir.isDirectory())
            res = new Response(HTTP_INTERNALERROR, MIME_PLAINTEXT,
                    "INTERNAL ERRROR: serveFile(): given homeDir is not a directory.");

        if (res == null) {
            // Remove URL arguments
            uri = uri.trim().replace(File.separatorChar, '/');
            if (uri.indexOf('?') >= 0)
                uri = uri.substring(0, uri.indexOf('?'));

            // Prohibit getting out of current directory
            if (uri.startsWith("..") || uri.endsWith("..") || uri.indexOf("../") >= 0)
                res = new Response(HTTP_FORBIDDEN, MIME_PLAINTEXT,
                        "FORBIDDEN: Won't serve ../ for security reasons.");
        }

        File f = new File(homeDir, uri);
        if (res == null && !f.exists())
            res = new Response(HTTP_NOTFOUND, MIME_PLAINTEXT,
                    "Error 404, file not found.");

        // List the directory, if necessary
        if (res == null && f.isDirectory()) {
            // Browsers get confused without '/' after the
            // directory, send a redirect.
            if (!uri.endsWith("/")) {
                uri += "/";
                res = new Response(HTTP_REDIRECT, MIME_HTML,
                        "<html><body>Redirected: <a href=\"" + uri + "\">" +
                                uri + "</a></body></html>");
                res.addHeader("Location", uri);
            }

            if (res == null) {
                // First try index.html and index.htm
                if (new File(f, "index.html").exists())
                    f = new File(homeDir, uri + "/index.html");
                else if (new File(f, "index.htm").exists())
                    f = new File(homeDir, uri + "/index.htm");
                    // No index file, list the directory if it is readable
                else if (allowDirectoryListing && f.canRead()) {
                    String[] files = f.list();
                    String msg = "<html><body><h1>Directory " + uri + "</h1><br/>";

                    if (uri.length() > 1) {
                        String u = uri.substring(0, uri.length() - 1);
                        int slash = u.lastIndexOf('/');
                        if (slash >= 0 && slash < u.length())
                            msg += "<b><a href=\"" + uri.substring(0, slash + 1) + "\">..</a></b><br/>";
                    }

                    if (files != null) {
                        for (int i = 0; i < files.length; ++i) {
                            File curFile = new File(f, files[i]);
                            boolean dir = curFile.isDirectory();
                            if (dir) {
                                msg += "<b>";
                                files[i] += "/";
                            }

                            msg += "<a href=\"" + encodeUri(uri + files[i]) + "\">" +
                                    files[i] + "</a>";

                            // Show file size
                            if (curFile.isFile()) {
                                long len = curFile.length();
                                msg += " &nbsp;<font size=2>(";
                                if (len < 1024)
                                    msg += len + " bytes";
                                else if (len < 1024 * 1024)
                                    msg += len / 1024 + "." + (len % 1024 / 10 % 100) + " KB";
                                else
                                    msg += len / (1024 * 1024) + "." + len % (1024 * 1024) / 10 % 100 + " MB";

                                msg += ")</font>";
                            }
                            msg += "<br/>";
                            if (dir) msg += "</b>";
                        }
                    }
                    msg += "</body></html>";
                    res = new Response(HTTP_OK, MIME_HTML, msg);
                } else {
                    res = new Response(HTTP_FORBIDDEN, MIME_PLAINTEXT,
                            "FORBIDDEN: No directory listing.");
                }
            }
        }

        try {
            if (res == null) {
                // Get MIME type from file name extension, if possible
                String mime = null;
                int dot = f.getCanonicalPath().lastIndexOf('.');
                if (dot >= 0)
                    mime = (String) theMimeTypes.get(f.getCanonicalPath().substring(dot + 1).toLowerCase());
                if (mime == null)
                    mime = MIME_DEFAULT_BINARY;

                // Support (simple) skipping:
                long startFrom = 0;
                long endAt = -1;
                String range = header.getProperty("range");
                if (range != null) {
                    if (range.startsWith("bytes=")) {
                        range = range.substring("bytes=".length());
                        int minus = range.indexOf('-');
                        try {
                            if (minus > 0) {
                                startFrom = Long.parseLong(range.substring(0, minus));
                                endAt = Long.parseLong(range.substring(minus + 1));
                            }
                        } catch (NumberFormatException nfe) {
                        }
                    }
                }

                // Change return code and add Content-Range header when skipping is requested
                long fileLen = f.length();
                if (range != null && startFrom >= 0) {
                    if (startFrom >= fileLen) {
                        res = new Response(HTTP_RANGE_NOT_SATISFIABLE, MIME_PLAINTEXT, "");
                        res.addHeader("Content-Range", "bytes 0-0/" + fileLen);
                    } else {
                        if (endAt < 0)
                            endAt = fileLen - 1;
                        long newLen = endAt - startFrom + 1;
                        if (newLen < 0) newLen = 0;

                        final long dataLen = newLen;
                        FileInputStream fis = new FileInputStream(f) {
                            public int available() throws IOException {
                                return (int) dataLen;
                            }
                        };
                        fis.skip(startFrom);

                        res = new Response(HTTP_PARTIALCONTENT, mime, fis);
                        res.addHeader("Content-Length", "" + dataLen);
                        res.addHeader("Content-Range", "bytes " + startFrom + "-" + endAt + "/" + fileLen);
                    }
                } else {
                    res = new Response(HTTP_OK, mime, new FileInputStream(f));
                    res.addHeader("Content-Length", "" + fileLen);
                }
            }
        } catch (IOException ioe) {
            res = new Response(HTTP_FORBIDDEN, MIME_PLAINTEXT, "FORBIDDEN: Reading file failed.");
        }

        res.addHeader("Accept-Ranges", "bytes"); // Announce that the file server accepts partial content requestes
        return res;
    }

    /**
     * Hashtable mapping (String)FILENAME_EXTENSION -> (String)MIME_TYPE
     */
    private static Hashtable theMimeTypes = new Hashtable();

    static {
        StringTokenizer st = new StringTokenizer(
                "css		text/css " +
                        "js			text/javascript " +
                        "htm		text/html " +
                        "html		text/html " +
                        "txt		text/plain " +
                        "asc		text/plain " +
                        "gif		image/gif " +
                        "jpg		image/jpeg " +
                        "jpeg		image/jpeg " +
                        "png		image/png " +
                        "mp3		audio/mpeg " +
                        "m3u		audio/mpeg-url " +
                        "pdf		application/pdf " +
                        "doc		application/msword " +
                        "ogg		application/x-ogg " +
                        "zip		application/octet-stream " +
                        "exe		application/octet-stream " +
                        "class		application/octet-stream ");
        while (st.hasMoreTokens())
            theMimeTypes.put(st.nextToken(), st.nextToken());
    }

    /**
     * GMT date formatter
     */
    private static java.text.SimpleDateFormat gmtFrmt;

    static {
        gmtFrmt = new java.text.SimpleDateFormat("E, d MMM yyyy HH:mm:ss 'GMT'", Locale.US);
        gmtFrmt.setTimeZone(TimeZone.getTimeZone("GMT"));
    }

    /**
     * The distribution licence
     */
    private static final String LICENCE =
            "Copyright (C) 2001,2005-2011 by Jarno Elonen <elonen@iki.fi>\n" +
                    "and Copyright (C) 2010 by Konstantinos Togias <info@ktogias.gr>\n" +
                    "\n" +
                    "Redistribution and use in source and binary forms, with or without\n" +
                    "modification, are permitted provided that the following conditions\n" +
                    "are met:\n" +
                    "\n" +
                    "Redistributions of source code must retain the above copyright notice,\n" +
                    "this list of conditions and the following disclaimer. Redistributions in\n" +
                    "binary form must reproduce the above copyright notice, this list of\n" +
                    "conditions and the following disclaimer in the documentation and/or other\n" +
                    "materials provided with the distribution. The name of the author may not\n" +
                    "be used to endorse or promote products derived from this software without\n" +
                    "specific prior written permission. \n" +
                    " \n" +
                    "THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n" +
                    "IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n" +
                    "OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n" +
                    "IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n" +
                    "INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT\n" +
                    "NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n" +
                    "DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n" +
                    "THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n" +
                    "(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n" +
                    "OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.";
}

